A 62-year-old woman presents with sudden onset right-sided weakness and aphasia 90 minutes ago. CT head shows no haemorrhage. According to Canadian Stroke Best Practice recommendations, which is the most appropriate next step?AAdminister IV alteplase if no contraindicationsBStart aspirin and delay thrombolysis for 24 hoursCObserve for spontaneous improvement with no acute therapyDStart therapeutic low-molecular-weight heparin immediatelyEOrder MRI and wait for results before treatmentCheck my answer